The Evaluation of sample position effect on activation by reactor neutrons

Takayama, Naoki; Harada, Hideo   ; Komeda, Masao   

As a basic research to accurately perform the activation experiment by the neutrons in the nuclear reactor, the irradiation position dependence of the neutron flux in the HR-1 irradiation hole of JRR-3 was calculated using MVP-3. Based on the calculation results, the influence of the deviation of the position of the metal foil for monitoring the neutron flux and the irradiated sample on the activation amount was evaluated. As a result, a significant effect was confirmed, and findings were obtained to enhance the method of deriving activation amounts and neutron cross sections.